<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        #main {
            width: 100%;
            height: 100%;
            background-color: sandybrown;
        }

        #content {
            margin-left: 220px;
            height: 200px;
            background-color: forestgreen;
        }

        #left {
            float: left;
            margin-left: -100%;
            width: 220px;
            height: 200px;
            background-color: aqua;
        }
        #margin-inner {
            float: left;
            width: 100%;
            height: 100%;
        }
    </style>
</head>
<body>
<div id="main">
    <div id="margin-inner">
        <div id="content">ss</div>
    </div>
    <div id="left">fff</div>
</div>
</body>
</html>